Cut-off blade with insert

ABSTRACT

A cutting blade of the cut-off type improved in the provision of a groove in the blade face receiving a separate insert.

1 States 010111 1 1 1 3,795,959

Shephard Mar. 12, 1974 CUT-OFF BLADE WITH INSERT 2,623,271 12/1952Girardin 29/96 2,944,323 7/1960 Stadler 76/101 x [76] Inventor: Donashephafdi 11500 Lambs 2,623,271 12/1952 0116161111 29/96 Memplvs, Mlch-48041 2,944,323 7 1960 Stadler 76/101 x 3,320,653 5/1967 Shephard...29/95 [22] 1972 3,516,310 6/1970 Lemanski 29/96 x [21} Appl. N0.:234,224

Primary Examiner-Andrew R. Juhasz Assistant ExaminerWilliam R. BriggsCell. .fiigdziijgg Attorney Agent or Firm Cuen, settle Sloman & 58 Field61 Search 29/95, 96; 82/13, 36; Canto l [57] ABSTRACT [56] Referen Cit dA cutting blade of the cut-off type improved in the UNITED STATESPATENTS provision of a groove in the blade face receiving 21 sep-3,516,310 6 1970 Lemanski 29/96 x mate msen' 3,320,653 5/1967 Shephard29/95 3 Claims, 6 Drawing Figures CUT-OFF BLADE WITH INSERT Thisapplication relates to cutting blades of the general class shown in saidpatent, but characterized by the provision of a groove in the upper faceof the blade receiving a separate insert.

A primary object of the present invention is to provide a blade having agroove receiving an separate insert, the latter functioning along withthe blade for improving the cutting action.

A further object is to provide a blade having a groove and a separateinsert in such groove, the insert being adapted to be removably butfirmly held in the groove, preferably by releasable clamping means,whereby the insert may be easily assembled upon the blade body.

Preferred embodiments of the present invention have been shown, it beingunderstood that the illustrations are by way of example only, andwithout limitation to the details of the blades illustrated.

The preferred embodiments are shown in the appended drawing. In thedrawing:

FIG. I is a fragmentary front perspective view of one form of the bladewith one form of insert in place.

FIG. 2 is a perspective view of a modified form of insert for the bladeof FIG. 1.

FIG. 3 is a view similar to FIG. 1 of a second form of blade with oneform of insert in place.

FIG. 4 is an end view of a modified form of insert for the blade of FIG.3.

FIG. 5 is a small scale end view of a mechanical holder for the bladeand its insert.

FIG. 6 is a fragmentary side view as if on arrow 6 of FIG. 5.

DETAILED DESCRIPTION FIG. 1 shows, an elongated blade 10 having a narrowshank l2, and an enlarged wider head 14, hollow ground across its upperface 16 and its sides 18. Face 16 has a longitudinally extending groove20 with base 22 and tapered sides 24, firmly seating an elongated insert26, also having a base 28, tapered sides and face 32.

Sides 24, 30 are at complementary symmetrical acute angles to thecentral axial plane P of the blade so that the groove is of taperedtruncated Vee form, whereby the insert will seat firmly in the groove,to seal it and thus inhibit lodgement of chips and cuttings in thegroove.

The acute angles may be of one dimension, as shown in FIGS. 1-2, or ofanother, as shown in FIGS. 3-4.

The insert faces 32 may be flat ground, as in FIGS. 2 and 4, or hollowground, as in FIGS. 1 and 3.

The insert may be brazed into the groove; but, for reasons of economy.and throwaway, it is preferred to leave it free of the blade, and toclamp it in place in the groove during blade use.

The insert and blade are separate, and separately formed to accuratedimension, so that proper assembly, that is to say, proper seating andclampingof the insert in the groove causes the insert to seat so in thegroove as to seal it and thus prevent'chip lodgement or insertdeplacement.

The insert may be shipped to the customer by the blade maker in aprefinished form, and the customer will then grind the insert for finaluse; or this finishing may be done by the blade maker, before shipment.

A mechanical holder for the blade and insert is shown, by way ofexample,in FIGS. 5-6. The holder includes a base block 40, a blade clamp 42having an insert clamp 44, and a screw bolt 46 as shown. When the screw46 is tightened down, it causes the blade clamp 42 and the insert clamp44 to clamp the blade 10 and insert 26 properly in place in block 40 andin groove 20, the bevel at 48 of parts 40-42 assisting in the clampingaction.

It may be, however, though it is not preferred, that the insert may bepermanently held in groove 20 by brazing or the like. A blade holder isnevertheless required in use.

CONCLUSION It will be observed that the two-piece blade hereindisclosed, including the basic blade and an insert seated in a groove ofsuch blade, provides a more effective cutting action because of thepresence of four cutting points, two on the outer exposed edges of theinsert and two at the outer exposed edges of the blade, and thusprovides a more effective and useful cutting means.

It will also be observed that the insert, whether brazed for holding itin the groove or whether held by the releasable clamp means shown inFIGS. 5-6, in either case, the insert completely seals the groove andprevents the lodging of chips in the groove.

Now having described the blade herein disclosed, reference should be hadto the claims which follow.

I claim:

1. In an elongated blade of the character described, having a narrowshank and thereabove an enlarged wider head; the improvement comprising:

the upper face of said head having a longitudinally extending groovebetween and spaced from the sides of the head; in combination with anelongated and longitudinally extending separate cutter insert seated insaid groove;

with the sides of the groove and the sides of the insert being atcomplementary acute angles to the central axial plane of the blade sothat the groove is of truncated Vee form;

with the groove and the insert widening outwardly,

whereby the insert tends to wedge downward into the groove; and with theinsert tending to seal the groove completely to inhibit lodgement ofchips in such groove;

with the groove and insert being so dimensioned that the insertcompletely fills and seals the groove, when the insert is removablyseated and wedged down into the groove, and even though not integrallyfixed in the groove, whereby the lodging of cuttings or chips in thegroove is assuredly completely inhibited;

with the sides of the head being undercut and with the insert projectingwell above the blade to expose the sides of the insert above the blade;

with the exposed insert sides thus also being undercut, to provide threecutting edges and to eliminate radii at the intersections of the upperface of the head and the side faces of the insert;

and with the sides of the blade being so remote from the sides of thegroove that the wall areas of the blade on both sides of the groove areof sufficient thickness to provide side brace abutments of considerablestrength to bear against the sides of the insert, in thicknesssufficient to prevent chattering of the insert during cutting use of theblade and insert;

and adjustably but releasably biasing and wedging the insert downwardlyand properly into the blade groove.

3. A blade and insert combination according to claim 1, wherein thesides of the insert are each formed in one continuous plane, whichincludes that part of the side in the groove, and also that part of theside exposed above the groove.

1. In an elongated blade of the character described, having a narrowshank and thereabove an enlarged wider head; the improvement comprising:the upper face of said head having a longitudinally extending groovebetween and spaced from the sides of the head; in combination with anelongated and longitudinally extending separate cutter insert seated insaid groove; with the sides of the groove and the sides of the insertbeing at complementary acute angles to the central axial plane of theblade so that the groove is of truncated Vee form; with the groove andthe insert widening outwardly, whereby the insert tends to wedgedownward into the groove; and with the insert tending to seal the groovecompletely to inhibit lodgement of chips in such groove; with the grooveand insert being so dimensioned that the insert completely fills andseals the groove, when the insert is removably seated and wedged downinto the groove, and even though not integrally fixed in the groove,whereby the lodging of cuttings or chips in the groove is assuredlycompletely inhibited; with the sides of the head being undercut and withthe insert projecting well above the blade to expose the sides of theinsert above the blade; with the exposed insert sides thus also beingundercut, to provide three cutting edges and to eliminate radii at theintersections of the upper face of the head and the side faces of theinsert; and with the sides of the blade being so remote from the sidesof the groove that the wall areas of the blade on both sides of thegroove are of sufficient thickness to provide side brace abutments ofconsiderable strength to bear against the sides of the insert, inthickness sufficient to prevent chattering of the insert during cuttinguse of the blade and insert; and with the central cutting edge on theinsert overhanging both side cutting edges of the blade head by virtueof the acute angular disposition of the insert.
 2. A blade according toclaim 1, in further combination with a mechanical holder for a blade andan insert in the blade groove, including means for holding the bladefirmly when it is in use, and simultaneously firmly and adjustably butreleasably biasing and wedging the insert downwardly and properly intothe blade groove.
 3. A blade and insert combination according to claim1, wherein the sides of the insert are each formed in one continuousplane, which includes that part of the side in the groove, and also thatpart of the side exposed above the groove.